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Tinker where the tinkering's good.

Matthew V Rockman1, David L Stern

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA.

Trends in Genetics : TIG
|June 3, 2008
PubMed
Summary
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Genetic mutations in cis-regulatory regions are key drivers of phenotypic evolution. In Drosophila santomea, disruptions in a gene enhancer explain reduced pigmentation, supporting this evolutionary principle.

Area of Science:

  • Evolutionary genetics
  • Developmental biology

Background:

  • Phenotypic evolution is driven by genetic changes.
  • Mutations in cis-regulatory regions are hypothesized to be major contributors due to their ability to modulate gene expression without pleiotropic effects.
  • Understanding these genetic underpinnings is crucial for evolutionary biology.

Purpose of the Study:

  • To investigate the genetic basis of phenotypic evolution in Drosophila santomea.
  • To determine if cis-regulatory mutations explain the observed differences in pigmentation.
  • To test the hypothesis that cis-regulatory changes are a predominant cause of phenotypic evolution.

Main Methods:

  • Comparative genomics analysis of Drosophila species.
  • Identification and characterization of cis-regulatory elements, specifically enhancers.

Related Experiment Videos

  • Functional analysis of gene regulatory regions involved in pigmentation.

    • Main Results:

    • Multiple mutations were identified in an abdominal enhancer of the tan gene.
    • These mutations disrupt the enhancer's function, leading to altered gene activity.
    • The identified mutations in the cis-regulatory region of the tan gene correlate with reduced abdominal pigmentation in Drosophila santomea.

    Conclusions:

    • Cis-regulatory mutations, specifically in enhancers, play a significant role in shaping phenotypic evolution.
    • The genetic basis of reduced pigmentation in Drosophila santomea is partly explained by mutations affecting a tan gene enhancer.
    • This provides empirical support for the principle that cis-regulatory changes are a major source of adaptive evolution.